Abstract
The diagnosis and illustration Veloira (1959) published of her new species Thamnium quisumbingii have made me assume that the species might in fact belong to Neckeropsis. This assumption proved to be correct upon the examination of an isotype present in E.B. Bartram’s herbarium. The plants represent a rather unusual form of Neckeropsis boniana (Besch.) Touw et Ochyra. In her description Veloira stressed the presence of numerous flagelliform branchlets. More or less attenuate, microphyllous branchlets are commonly found in N. boniana, but they are exceptionally numerous in the type of Thamnium quisumbingii. Many stem apices are flagelliform as well, and some stems show an alternation of microphyllous and normally foliate parts. In a second collection made at the same occasion (Edaño 15938), and reported before (Touw 1987) microphyllous parts are less numerous. Both collections probably have been taken from the same population.